Reversible Crystal–Glass Transition in a Metal Halide Perovskite

Advanced Materials, Journal Year: 2020, Volume and Issue: 33(3)

Published: Dec. 6, 2020

Abstract Crystalline metal halide perovskites (MHPs) have provided unprecedented advances in interdisciplinary fields of materials, electronics, and photonics. While crystallinity offers numerous advantages, the ability to access a glassy state with distinct properties provides unique opportunities extend associated structure–property relationship, as well broaden application space for MHPs. Amorphous analogs MHPs so far been restricted high pressures, limiting detailed studies applications. Here, 2D MHP is structurally tailored using bulky chiral organic cations exhibit an unusual confluence exceptionally low melting temperature (175 °C) inhibited crystallization. The can thus be melt‐quenched into stable state, otherwise analogous racemic MHP. Facile reversible switching between crystalline states demonstrated MHP, each optoelectronic character, opening new applications including, example nonvolatile memory, optical communication, neuromorphic computing.

Language: Английский

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Realizing Tunable White Light Emission in Lead-Free Indium(III) Bromine Hybrid Single Crystals through Antimony(III) Cation Doping

The Journal of Physical Chemistry Letters, Journal Year: 2020, Volume and Issue: 11(23), P. 10164 - 10172

Published: Nov. 16, 2020

Low-dimensional metal halide hybrids (OIMHs) have recently been explored as single-component white-light emitters for use in solid-state lighting. However, it still remains challenging to realize tunable emission lead-free zero-dimensional (0D) hybrid system. Here, a combination strategy has proposed through doping Sb3+ enabling and balancing multiple centers toward the multiband warm white light. We first synthesized new 0D (C8NH12)6InBr9·H2O single crystal, which isolated [InBr6]3- octahedral units are separated by large organic cations [C8NH12]+. exhibits dual-band emissions with one intense cyan weak red tail. The low-energy ultrabroadband tail can be greatly enhanced doping. Experimental data first-principles calculations reveal that original dominant is originated from [C8NH12]+ broadband ascribed self-trapped excitons [In(Sb)Br6]3-. When Sb concentration 0.1%, photoluminescence quantum efficiency of 23.36%, correlated color temperature 3347 K, rendering index up 84 achieved. This work represents significant step realization environmental-friendly, high-performance light-emitting materials.

Language: Английский

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A bright future for engineering piezoelectric 2D crystals

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 51(2), P. 650 - 671

Published: Dec. 21, 2021

The piezoelectric effect, mechanical-to-electrical and electrical-to-mechanical energy conversion, is highly beneficial for functional responsive electronic devices. To fully exploit this property, miniaturization of materials the subject intense research. Indeed, select atomically thin 2D strongly exhibit effect. family crystals consists over 7000 chemically distinct members that can be further manipulated in terms strain, functionalization, elemental substitution (i.e. Janus crystals), defect engineering to induce a response. Additionally, most stack with other similar or dissimilar form much greater number complex heterostructures whose properties are quite different those individual constituents. unprecedented flexibility tailoring crystal properties, coupled their minimal thickness, make these emerging attractive advanced applications include pressure sensing, piezocatalysis, piezotronics, harvesting. This review summarizes literature on piezoelectricity, particularly out-of-plane vast as well heterostructures. It also describes methods induce, enhance, control properties. volume data role machine learning predicting piezoelectricity discussed detail, prospective outlook field provided.

Language: Английский

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Effective Piezo‐Phototronic Enhancement of Flexible Photodetectors Based on 2D Hybrid Perovskite Ferroelectric Single‐Crystalline Thin‐Films

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(32)

Published: June 27, 2021

Abstract 2D hybrid perovskites are very attractive for optoelectronic applications because of their numerous exceptional properties. The emerging perovskite ferroelectrics, in which the coupling spontaneous polarization and piezoelectric effects, as well photoexcitation semiconductor behaviors, have great appeal field piezo‐phototronics that enable to effectively improve performance devices via modulating electro‐optical processes. However, current studies on ferroelectrics focus bulk ceramics cannot endure irregular mechanical deformation limit application flexible optoelectronics piezo‐phototronics. Herein, we synthesize ferroelectric EA 4 Pb 3 Br 10 single‐crystalline thin‐films (SCFs) integration into photodetectors. in‐plane multiaxial ferroelectricity is evident within SCFs through systematic characterizations. Flexible photodetectors based achieved with an impressive photodetection performance. More importantly, incorporated effective coefficient show promise observation piezo‐phototronic effect, capable greatly enhancing photodetector Under external strains, responsivity can be modulated by effect a remarkable enhancement up 284%. Our findings shed light offer promising avenue broaden functionalities ferroelectrics.

Language: Английский

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Photophysics of 2D Organic–Inorganic Hybrid Lead Halide Perovskites: Progress, Debates, and Challenges

Advanced Science, Journal Year: 2021, Volume and Issue: 8(6)

Published: Jan. 29, 2021

2D organic-inorganic hybrid Ruddlesden-Popper perovskites (RPPs) have recently attracted increasing attention due to their excellent environmental stability, high degree of electronic tunability, and natural multiquantum-well structures. Although there is a rapid development photoelectronic applications in solar cells, photodetectors, light emitting diodes (LEDs), lasers based on RPPs, the state-of-the-art performance far inferior that existing devices because limited understanding fundamental physics, especially special photophysics carrier dynamics, excitonic fine structures, quasiparticles, spin-related effect. Thus, still plenty room improve performances RPPs by enhancing knowledge photophysics. This review highlights fundamentally different from conventional 3D congeners. It also provides most recent progress, debates, challenges, prospects, in-depth perovskites, which significant for not only boosting LEDs, but future lasers, spintronics, quantum information, integrated photonic chips.

Language: Английский

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